The Day the Earth Stood Still is a 2008 American science fiction film serving as a remake of the 1951 film of the same name, which, in turn, was based on the 1940 short story "Farewell to the Master". Directed by Scott Derrickson from a screenplay by David Scarpa, it stars Keanu Reeves as Klaatu, an alien sent to try to change human behavior in an effort to save Earth from environmental degradation; this version replaces the Cold War–era theme of potential nuclear warfare with the contemporary issue of negative human impact on the environment. It co-stars Jennifer Connelly, Jaden Smith, John Cleese, Jon Hamm, and Kathy Bates.

The Day the Earth Stood Still was originally scheduled for release on May 9, 2008, but was released on a roll-out schedule beginning December 12, 2008, screening in both conventional and IMAX theaters. It was met with generally negative reviews from critics but was a financial success, grossing over $233 million worldwide.